From today, any registered user can change his login to a two-factor authentication. A choice between two processes is possible. You can use the Google Authenticator or make the the Autentification by using a Yubikey NEO.
What kind of type you can use is shown under https://www.yubico.com/products/yubikey-hardware/
Before you can use the Google Authenticator you need to install the app "Authenticator" on your smartphone.